North Carolina Home Inspector Practice Exam

Can a GFCI outlet be installed on a two-wire electrical system?

1. No, it is unsafe

2. Yes, by connecting to a separate ground

3. Yes, by tying the GFCI ground to the house neutral

4. Only with a qualified electrician

The correct answer is: Yes, by tying the GFCI ground to the house neutral

In the context of a two-wire electrical system, the option stating that a GFCI outlet can be installed by tying the GFCI ground to the house neutral reflects an understanding of how these devices function in safety. GFCI (Ground Fault Circuit Interrupter) outlets are designed to protect against electrical shocks by detecting ground faults and cutting off power. In a two-wire electrical system, there is typically no separate ground wire; instead, the system consists of a hot wire and a neutral wire. When a GFCI is installed in such a system, the configuration allows for the neutral connection to serve as a reference point for ground potential. This is applicable as long as the GFCI is specifically identified for such installations by the manufacturer, and the installation conforms to local electrical codes. This method enables the GFCI to function effectively in a way that it can detect imbalances in current, signaling when the system is presenting a possible shock hazard. However, it is important to ensure that the overall system remains safe and compliant with safety codes, which is why consulting with qualified professionals when unsure can be beneficial. Understanding this option helps clarify the intricacies of installing GFCI outlets in older wiring systems and acknowledges the underlying principle of